Studies on Sesquiterpene Glycosides from Crepis japonica BENTH.

Abstract

Nine new guainolide-type glycosides, crepisides A (II), B (III), C (IV), D (V), E (VI), F (VII), G (VIII), H (IX), and I (X), have been isolated from Crepis japonica BENTH., together with a known glycoside, glucozaluzanin C (I). The structures of II-X were established on the basis of chemical and spectral data.